Film clamping device and stick automatic film sleeving shrinking machine

Abstract

The utility model discloses a film clamping device, which relates to the technical field of mechanical equipment, the film clamping device is applied to a stick automatic film sleeving shrinking machine, the film clamping device comprises two outer clamping blocks and two inner clamping pieces, the two outer clamping blocks are provided with opposite semicircular clamping holes, the two inner clamping pieces are oppositely arranged in the clamping holes, and one ends of the inner clamping pieces are narrowed and extend out of the front sides of the clamping holes; a linkage mechanism is arranged between the outer clamping blocks and the inner clamping pieces, when the two outer clamping blocks get close to each other, the two inner clamping pieces are driven by the linkage mechanism to rotate and get away from each other, and the outer walls of the inner clamping pieces and the inner walls of the clamping holes are attached to each other. When the two outer clamping blocks are far away from each other, the two inner clamping pieces are driven by the linkage mechanism to rotate and approach each other, and the outer walls of the inner clamping pieces are separated from the inner walls of the clamping holes. The film clamping device disclosed by the utility model is convenient for clamping the film sleeve.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical equipment technology, specifically relating to a film clamping device and an automatic film shrinking machine with rollers. Background Technology

[0002] The outer surface of the sticks of brooms, mops, etc., needs to be covered with heat-shrink film for easy gripping and use. Existing heat-shrink film is a strip-shaped, hollow film sleeve, initially with its inner hole not open and rolled into a bundle. During processing, the ends of the film sleeve need to be opened, the stick inserted into the sleeve, and then cut. After heating, the sleeve adheres tightly to the surface of the stick. This manual application method is inefficient. Therefore, CN212829491U discloses a heat-shrink film application machine for sticks and CN213675474U discloses a multi-functional heat-shrink film application machine for bent sticks, both of which can automate the application process and improve efficiency. These machines primarily use a clamping device to hold the ends of the film sleeve. The inner clamping block of the clamping device extends into the sleeve, while the outer clamping block is outside. The ends of the sleeve are held between the inner and outer clamping blocks. A moving component drives the clamping device along the length of the stick, applying the heat-shrink film to the outer surface of the stick. Because the existing membrane clamping device has four inner clamping blocks, they need to be brought together to reduce the space occupied before they can be inserted into the membrane sleeve. However, even when the four inner clamping blocks are brought together, they still occupy a certain width. The inner hole of the membrane sleeve is small, making it difficult for the inner clamping blocks to be inserted into the membrane sleeve and making it inconvenient to clamp the membrane sleeve. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a film clamping device and an automatic film shrinking machine with rollers, which facilitates the clamping of film sleeves.

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] The film clamping device includes two outer clamping blocks and two inner clamping plates. The two outer clamping blocks are provided with opposing semi-circular clamping holes, and the two inner clamping plates are disposed opposite each other in the clamping holes. One end of the inner clamping plate is narrowed and extends out of the front side of the clamping hole. A linkage mechanism is provided between the outer clamping blocks and the inner clamping plates. When the two outer clamping blocks approach each other, the linkage mechanism drives the two inner clamping plates to rotate away from each other, and the outer wall of the inner clamping plate and the inner wall of the clamping hole are put into contact. When the two outer clamping blocks move away from each other, the linkage mechanism drives the two inner clamping plates to rotate and approach each other, and the outer wall of the inner clamping plate and the inner wall of the clamping hole are separated.

[0006] Furthermore, the linkage mechanism includes a fixed seat, a rotating plate, a rotating shaft, a wedge, and a first spring; the fixed seat has a groove in the middle, the rotating plate includes two pieces, the rotating plate is located in the groove, one end of the rotating plate is rotatably connected to the fixed seat through the rotating shaft, the inner clamp is fixedly connected to the end of the rotating plate near the rotating shaft, the first spring is located at the other end of the rotating plate, and the wedge is located on the outer end of the outer clamp, the wedge is located on the side of the outer clamp opposite to the rotating plate.

[0007] Furthermore, the linkage mechanism also includes a pneumatic clamp and a lower stop block. The pneumatic clamp is connected to two outer clamp blocks to drive them to move closer or further away. The lower stop block is located at the lower end of the fixed base, and there is a horizontal groove between the lower stop block and the fixed base. The outer clamp blocks are slidably located on the groove.

[0008] An automatic roll shrinking machine includes the film clamping device described above, as well as a frame and a film shrinking mechanism. The film shrinking mechanism is mounted on the frame and includes a first slide plate, a slide rail, and a first transmission chain. The first slide plate is slidably mounted on the slide rail. The two sides of the first slide plate are fixedly connected to the first transmission chain. The first slide plate has multiple roll-through holes. The film clamping device includes several fixedly mounted on the first slide plate, and each film clamping device corresponds to one of the roll-through holes.

[0009] Furthermore, the film-coating mechanism also includes a second slide plate and a third slide plate located on the slide rail. A push plate cylinder is located at one end of the slide rail on the frame. The push plate cylinder is connected to the third slide plate. Several push rods are provided on the third slide plate. The push rods are fitted with a second spring that connects the second slide plate and the third slide plate. Several guide holes are provided on the second slide plate that pass through the push rods.

[0010] Furthermore, the frame is equipped with a second drive chain for conveying the rod, a lifting plate, and a lifting cylinder. The second drive chain is perpendicular to the first drive chain. The lifting plate is located on both sides of the second drive chain, and the lifting cylinder is connected to the lower end of the lifting plate. The end of the second drive chain is equipped with a conveyor belt for discharging the rod. A steam chamber is provided on the frame. The conveyor belt passes through the steam chamber, and the steam chamber is connected to a steam generator through a pipe.

[0011] Furthermore, the frame is equipped with a membrane stretcher, one end of which is pointed and the other end is square-shaped, with the square end facing the membrane clamp. The width of the middle section of the membrane stretcher is smaller than the width of the two ends. Several first rollers are provided on the membrane stretcher, and several second rollers are provided on the frame. The second rollers are located on both sides of the middle section of the membrane stretcher, and the distance between the second rollers is smaller than the width of the two ends of the membrane stretcher. The membrane stretcher is used to be inserted into the membrane sleeve.

[0012] Furthermore, the frame is equipped with a film cutting mechanism and a film pressing telescopic cylinder. The film pressing telescopic cylinder is located on one side of the film clamping device, and the film sleeve passes between the film pressing telescopic cylinder and the frame. The film cutting mechanism is located between the film clamping device and the film pressing telescopic cylinder. The film cutting mechanism includes a first cutting blade, a second cutting blade, a fixed plate, a first connecting plate, a second connecting plate, and a shearing telescopic cylinder. The first and second cutting blades each include several pieces. The middle parts of the first and second cutting blades are hinged and connected to the fixed plate. The lower ends of the first connecting plate and the first cutting blade are hinged, and the lower ends of the second connecting plate and the second cutting blade are hinged. There are two shearing telescopic cylinders, which are respectively hinged between the first connecting plate and the fixed plate, and between the second connecting plate and the fixed plate.

[0013] Furthermore, it also includes a film material rack, which is equipped with several film material trays for placing film rolls. The lower end of the film material tray is equipped with a rotating rod and a tension spring. One end of the rotating rod is rotatably connected to the film material rack, and the other end of the rotating rod extends to the film material tray. A guide wheel is provided on the rotating rod at this end. One end of the tension spring is connected to the rotating rod, and the other end of the tension spring is connected to the film material rack.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this design, there are two inner clamping pieces. Because one end of the inner clamping piece is narrowed and extends outward from the front of the clamping hole, when the outer clamping block opens outward, the linkage mechanism drives the narrowed end of the inner clamping piece to basically fit together. Compared with the existing film clamping device, the width can be smaller, making it easier to insert into the port of the film sleeve. After the outer clamping blocks come close to each other, they cooperate with the inner clamping piece to clamp the port of the film sleeve. Therefore, the film clamping device of this design is more convenient for clamping the film sleeve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the film clamping device of this utility model when the outer clamping blocks are far apart.

[0017] Figure 2 This is a schematic diagram of the structure of the film clamping device of this utility model when the outer clamping blocks are close together.

[0018] Figure 3 This is an exploded view of the membrane clamping device of this utility model.

[0019] Figure 4 This is a structural schematic diagram of the fixed base and lower stop block of this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of the automatic film shrinking machine with rollers according to this utility model.

[0021] Figure 6 This is a schematic diagram of the film-coating mechanism of this utility model.

[0022] Figure 7 This is a schematic diagram of the film-coating mechanism, the second transmission chain, and the conveyor belt of this utility model.

[0023] Figure 8 This is a schematic diagram of the structure of the membrane stretcher and membrane shearing mechanism of this utility model.

[0024] Figure 9 This is a schematic diagram of the structure of the second transmission chain of this utility model.

[0025] Figure 10 This is a schematic diagram of the structure of the film material holder of this utility model.

[0026] Labels in the diagram: 1. Membrane clamp; 101. Pneumatic clamp; 102. Outer clamping block; 103. Inner clamping plate; 104. Rotating plate; 105. Lower stop block; 106. Clamping hole; 107. Wedge block; 108. Rotating shaft; 109. Fixed base; 110. First spring; 111. Groove; 112. Slide groove; 2. Membrane sleeve; 3. Roller; 4. Membrane sleeve mechanism; 401. First transmission chain; 402. First sliding plate; 403. Slide rail; 404. Third sliding plate; 405. Second sliding plate; 406. Push rod; 407. Second spring; 408. Push plate cylinder; 4 9. Guide hole; 5. Frame; 6. Second transmission chain; 7. Film cutting mechanism; 701. First shear blade; 702. Second shear blade; 703. Fixing plate; 704. First connecting piece; 705. Second connecting piece; 706. Shearing telescopic cylinder; 8. Film pressing telescopic cylinder; 9. Film stretcher; 10. First roller; 11. Second roller; 12. Film material rack; 13. Film material tray; 14. Guide wheel; 15. Lifting plate; 16. Lifting cylinder; 17. Conveyor belt; 18. Steam chamber; 19. Steam generator; 20. Tension spring; 21. Rotating rod. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] like Figures 1-4 As shown, the clamping device of this embodiment includes two outer clamping blocks 102 and two inner clamping pieces 103. The two outer clamping blocks 102 are provided with opposing semi-circular clamping holes 106, and the two inner clamping pieces 103 are disposed opposite each other in the clamping holes 106. One end of the inner clamping piece 103 is narrowed and extends out of the front side of the clamping hole 106. A linkage mechanism is provided between the outer clamping blocks 102 and the inner clamping pieces 103. When the two outer clamping blocks 102 approach each other, the linkage mechanism drives the two inner clamping pieces 103 to rotate away from each other, and the outer wall of the inner clamping piece 103 and the inner wall of the clamping hole 106 are put into contact. When the two outer clamping blocks 102 move away from each other, the linkage mechanism drives the two inner clamping pieces 103 to rotate towards each other, and the outer wall of the inner clamping piece 103 and the inner wall of the clamping hole 106 are separated.

[0029] The linkage mechanism includes a fixed base 109, a rotating plate 104, a rotating shaft 108, a wedge 107, and a first spring 110. The fixed base 109 has a groove 111 in the middle. The rotating plate 104 includes two pieces. The rotating plate 104 is located in the groove 111. One end of the rotating plate 104 is rotatably connected to the fixed base 109 through the rotating shaft 108. The inner clamping piece 103 is fixedly connected to the rotating plate 104 at one end near the rotating shaft 108. The first spring 110 is located at the other end of the rotating plate 104. The wedge 107 is located on the outer end of the outer clamping piece 102. The wedge 107 is located on the side of the outer clamping piece 102 opposite to the rotating plate 104. In addition, the linkage mechanism also includes a pneumatic clamp 101 and a lower stop block 105. The pneumatic clamp 101 is connected to two outer clamp blocks 102 to drive them to move closer or further away. The lower stop block 105 is located at the lower end of the fixed base 109. There is a horizontal slide groove 112 between the lower stop block 105 and the fixed base 109. The outer clamp blocks 102 are slidably disposed on the slide groove 112.

[0030] During operation, the pneumatic clamp 101 drives the outer clamping block 102 to move outward along the slide groove 112 and open. Under the original length action of the first spring 110, the rotating plate 104 rotates around the rotating shaft 108, thereby causing the inner clamping pieces 103 on both sides to come closer together. When the clamping device 1 moves closer to the film sleeve 2, the inner clamping pieces 103 extend into the port of the film sleeve 2. The pneumatic clamp 101 then drives the outer clamping block 102 to move inward along the slide groove 112, and the clamping hole 106 fits against the outer wall of the film sleeve 2. Under the action of the wedge block 107, the rotating plate 104 rotates in the opposite direction around the rotating shaft 108, and the first spring 110 is compressed, thereby causing the inner clamping pieces 103 on both sides to move away. In this way, the film sleeve 2 is clamped between the outer clamping block 102 and the inner clamping pieces 103. When the clamping device 1 moves in the length direction of the rod 3, it can be fitted onto the outside of the rod 3.

[0031] like Figures 5-10 As shown, an automatic film shrinking machine for rollers includes the aforementioned film clamping device 1, and a frame 5 and a film shrinking mechanism 4. The film shrinking mechanism 4 is mounted on the frame 5 and includes a first sliding plate 402, a slide rail 403, and a first transmission chain 401. The first sliding plate 402 is slidably mounted on the slide rail 403. The two sides of the first sliding plate 402 are fixedly connected to the first transmission chain 401. The first sliding plate 402 is provided with multiple roller holes. The film clamping device 1 includes several fixedly mounted on the first sliding plate 402, and each film clamping device 1 corresponds to one of the roller holes. The number of film clamping devices 1 can be four, six, or eight. One movement of the first sliding plate 402 can drive multiple film sleeves 2 to be wrapped around multiple rollers 3.

[0032] The film-coating mechanism 4 also includes a second slide plate 405 and a third slide plate 404 located on the slide rail 403. A pusher cylinder 408 is located at one end of the slide rail 403 on the frame 5. The pusher cylinder 408 is connected to the third slide plate 404. Several push rods 406 are provided on the third slide plate 404. A second spring 407 is sleeved on each push rod 406 and connected between the second slide plate 405 and the third slide plate 404. Several guide holes 409 pass through the push rods 406 on the second slide plate 405. The roller hole and guide holes 409 of the first slide plate 402 are opposite each other. The pusher cylinder 408 can push the third slide plate 404 towards the film clamp 1, which can hold the roller 3. When the first slide plate 402 can push the second slide plate 405 towards the third slide plate 404, causing the push rods 406 to pass through the roller hole, the end of the film sleeve 2 will exceed the end of the roller 3, thus completely enclosing the roller 3.

[0033] In addition, the frame 5 is equipped with a second transmission chain 6 for conveying the roller 3, a lifting plate 15, and a lifting cylinder 16. The second transmission chain 6 is perpendicular to the first transmission chain 401. The lifting plate 15 is located on both sides of the second transmission chain 6, and the lifting cylinder 16 is connected to the lower end of the lifting plate 15. The end of the second transmission chain 6 is equipped with a conveyor belt 17 for guiding the roller. The frame 5 is equipped with a steam chamber 18. The conveyor belt 17 passes through the steam chamber 18. The steam chamber 18 is connected to a steam generator 19 through a pipe. The second transmission chain 6 includes three sections, which can convey the roller 3 to the bottom of the film-coating mechanism 4. Then, the lifting cylinder 16 drives the lifting plate 15 to move upward, thereby moving the roller 3 to the height of the roller hole and the guide hole 409. The lifting plate 15 is made of soft plastic so that the first slide plate 402 can move through it.

[0034] The frame 5 is equipped with a membrane stretcher 9. One end of the membrane stretcher 9 is pointed, and the other end is square. The square end faces the membrane clamp 1. The width of the middle section of the membrane stretcher 9 is smaller than the width of the two ends. Several first rollers 10 are provided on the membrane stretcher 9, and several second rollers 11 are provided on the frame 5. The second rollers 11 are located on both sides of the middle section of the membrane stretcher 9. The spacing between the second rollers 11 is smaller than the width of the two ends of the membrane stretcher 9. The membrane stretcher 9 is used to be inserted into the membrane sleeve 2 and can open the port of the membrane sleeve 2 to facilitate clamping by the membrane clamp 1.

[0035] The frame 5 is equipped with a film cutting mechanism 7 and a film pressing telescopic cylinder 8. The film pressing telescopic cylinder 8 is located on one side of the film clamping device 1. The film sleeve 2 passes between the film pressing telescopic cylinder 8 and the frame 5. The film cutting mechanism 7 is located between the film clamping device 1 and the film pressing telescopic cylinder 8. The film cutting mechanism 7 includes a first cutting blade 701, a second cutting blade 702, a fixing plate 703, a first connecting piece 704, a second connecting piece 705, and a shearing telescopic cylinder 706. The first cutting blade 701 and the second cutting blade 702 each include several pieces. The middle parts of the first cutting blade 701 and the second cutting blade 702 are hinged and connected to the fixing plate 703. The first connecting piece 704 is hinged to the lower end of the first cutting blade 701. The second connecting piece 705 is hinged to the lower end of the second cutting blade 702. The shearing telescopic cylinder 706 includes two cylinders, which are respectively hinged between the first connecting piece 704 and the fixing plate 703, and between the second connecting piece 705 and the fixing plate 703. After the film is applied, one end of the film sleeve 2 is pressed onto the frame 5 by the film pressing telescopic cylinder 8, and the other end is clamped by the film clamping device 1. When the shearing telescopic cylinders 706 on both sides extend, they can drive the first connecting piece 704 and the second connecting piece 705, thereby simultaneously driving the first shearing piece 701 and the second shearing piece 702 to rotate relative to each other and cut the film sleeve 2.

[0036] The automatic shrink wrapping machine also includes a film rack 12, which has several film trays 13 for holding heat-shrinkable film. The lower end of each film tray 13 has a rotating rod 21 and a tension spring 20. One end of the rotating rod 21 is rotatably connected to the film rack 12, and the other end extends to the film tray 13. A guide wheel 14 is located at this end of the rotating rod 21. One end of the tension spring 20 is connected to the rotating rod 21, and the other end is connected to the film rack 12. The film sleeve 2 passes around the guide wheel 14 and is then connected to the film expander 9. When the film sleeve 2 is pulled, the rotating rod 21 rotates, and the tension spring 20 extends. When the film sleeve 2 is cut and released, the tension spring 20 returns to its original position, and the film sleeve 2 rotates back, thus preventing it from becoming tangled.

[0037] During operation, the second transmission chain 6 first transmits the roller 3 to the lower part of the film sleeve mechanism 4, and then the lifting plate 15 lifts the roller 3. Next, the first slide plate 402 slides along the slide rail 403 under the drive of the first transmission chain 401. After the film clamp 1 clamps the port of the film sleeve 2, the first transmission chain 401 drives the first slide plate 402 to move along the length of the roller 3, so that the film sleeve 2 is put on the outside of the roller 3. Then the lifting plate 15 descends, and the roller 3 after being filmed continues to be transmitted to the conveyor belt 17 by the second transmission chain 6. When the roller 3 passes through the steam chamber 18, the steam generator 19 generates steam, which causes the film sleeve 2 to shrink at high temperature and stick tightly to the outer surface of the roller 3.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A film clamping device, characterized in that: The device includes two outer clamping blocks and two inner clamping plates. The two outer clamping blocks have opposing semi-circular clamping holes, and the two inner clamping plates are disposed opposite each other within the clamping holes. One end of each inner clamping plate is narrowed and extends out of the front side of the clamping hole. A linkage mechanism is provided between the outer clamping blocks and the inner clamping plates. When the two outer clamping blocks approach each other, the linkage mechanism drives the two inner clamping plates to rotate away from each other, and the outer wall of the inner clamping plate and the inner wall of the clamping hole are in contact. When the two outer clamping blocks move away from each other, the linkage mechanism drives the two inner clamping plates to rotate towards each other, and the outer wall of the inner clamping plate and the inner wall of the clamping hole are separated.

2. The film clamping device according to claim 1, characterized in that: The linkage mechanism includes a fixed base, a rotating plate, a rotating shaft, a wedge, and a first spring. The fixed base has a groove in the middle. The rotating plate includes two pieces, which are disposed in the groove. One end of the rotating plate is rotatably connected to the fixed base through the rotating shaft. The inner clamp is fixedly connected to the end of the rotating plate near the rotating shaft. The first spring is disposed at the other end of the rotating plate. The wedge is disposed on the outer end of the outer clamp and on the side of the outer clamp opposite to the rotating plate.

3. The film clamping device according to claim 2, characterized in that: The linkage mechanism also includes a pneumatic clamp and a lower stop block. The pneumatic clamp is connected to two outer clamp blocks to drive them to move closer or further away. The lower stop block is located at the lower end of the fixed base. There is a horizontal sliding groove between the lower stop block and the fixed base. The outer clamp blocks are slidably disposed on the sliding groove.

4. An automatic roll-type film shrinking machine, characterized in that: The device includes a film clamping device as described in any one of claims 1 to 3, and a film clamping mechanism comprising a frame and a film clamping mechanism, the film clamping mechanism being disposed on the frame and comprising a first slide plate, a slide rail, and a first transmission chain; the first slide plate is slidably disposed on the slide rail; both sides of the first slide plate are fixedly connected to the first transmission chain; the first slide plate is provided with a plurality of roller holes, and the film clamping device comprises several fixedly installed on the first slide plate, the film clamping devices corresponding to the roller holes respectively.

5. The automatic roll-type film shrinking machine according to claim 4, characterized in that: The film-coating mechanism further includes a second slide plate and a third slide plate disposed on the slide rail. A push plate cylinder is disposed on one end of the slide rail on the frame. The push plate cylinder is connected to the third slide plate. Several push rods are disposed on the third slide plate. A second spring is sleeved on each push rod and connected between the second slide plate and the third slide plate. Several guide holes are disposed on the second slide plate that pass through the push rods.

6. The automatic roll-type film shrinking machine according to claim 4, characterized in that: The frame is equipped with a second transmission chain for conveying the rod, a lifting plate, and a lifting cylinder. The second transmission chain is perpendicular to the first transmission chain. The lifting plate is located on both sides of the second transmission chain, and the lifting cylinder is connected to the lower end of the lifting plate. The end of the second transmission chain is equipped with a conveyor belt for guiding the rod. The frame is equipped with a steam chamber, through which the conveyor belt passes. The steam chamber is connected to a steam generator via a pipe.

7. The automatic roll-type film shrinking machine according to claim 4, characterized in that: The frame is equipped with a membrane stretcher, one end of which is pointed and the other end is square-shaped, with the square end facing the membrane clamp. The width of the middle section of the membrane stretcher is smaller than the width of the two ends. The membrane stretcher is equipped with several first rollers, and the frame is equipped with several second rollers located on both sides of the middle section of the membrane stretcher. The spacing between the second rollers is smaller than the width of the two ends of the membrane stretcher. The membrane stretcher is used to be inserted into the membrane sleeve.

8. The automatic roll-type film shrinking machine according to claim 4, characterized in that: The frame is equipped with a film cutting mechanism and a film pressing telescopic cylinder. The film pressing telescopic cylinder is located on one side of the film clamping device. The film sleeve passes between the film pressing telescopic cylinder and the frame. The film cutting mechanism is located between the film clamping device and the film pressing telescopic cylinder. The film cutting mechanism includes a first cutting blade, a second cutting blade, a fixed plate, a first connecting piece, a second connecting piece, and a shearing telescopic cylinder. The first and second cutting blades each include several pieces. The middle parts of the first and second cutting blades are hinged to the fixed plate. The first connecting piece is hinged to the lower end of the first cutting blade, and the second connecting piece is hinged to the lower end of the second cutting blade. The shearing telescopic cylinder includes two cylinders, which are respectively hinged between the first connecting piece and the fixed plate, and between the second connecting piece and the fixed plate.

9. The automatic roll-type film shrinking machine according to claim 4, characterized in that: It also includes a film rack, on which several film trays for placing heat shrink film are provided. The lower end of the film tray is provided with a rotating rod and a tension spring. One end of the rotating rod is rotatably connected to the film rack, and the other end of the rotating rod extends to the film tray. A guide wheel is provided on the rotating rod at this end. One end of the tension spring is connected to the rotating rod, and the other end of the tension spring is connected to the film rack.

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